Delete row sig_1760ddac5e2b from signals

id sig_1760ddac5e2b
event_id evt_28c142730271
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_e5e58dbd0 ...
dedupe_key signal_enriched:discovery_ipo_delta:846d018bf82786 ...
throttle_s 0
created_at 2026-04-08T21:48:34.772061+00:00
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